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Enhanced photo- and thermo stability of Au nanorods conjugated with small thiols

Sonia Centi, Istituto di Fisica Applicata `Nello Carrara', Italy
Lucia Cavigli, Istituto di Fisica Applicata `Nello Carrara', Italy
Claudia Borri, Istituto di Fisica Applicata `Nello Carrara', Italy
Alessio Milanesi, Istituto di Fisica Applicata `Nello Carrara', Italy
Martina Banchelli, Istituto di Fisica Applicata `Nello Carrara', Italy
Sofia Chioccioli, Universita degli Studi di Firenze, Italy
Boris Khlebtsov, IBPPM RAS
Nikolai G. Khlebtsov, IBPPM RAS, Saratov State University
Paolo Matteini, Istituto di Fisica Applicata `Nello Carrara', Italy
Patrizia Bogani, Istituto di Fisica Applicata `Nello Carrara', Italy
Fulvio Ratto, Istituto di Fisica Applicata `Nello Carrara', Italy
Roberto Pini, Istituto di Fisica Applicata `Nello Carrara', Italy

Abstract

The stabilization of the optical properties of anisotropic plasmonic particles upon
thermal annealing and laser irradiation is an important issue in many biomedical appli-
cations. Here, we address the effect of small thiols on the thermal and photo-stability
of gold nanorods. As-synthesized colloids were treated with mixtures of thiolated
polyethylene glycol and methylbenzenethiol with molar ratios ranging from 0, for pure
PEG, to 20, and then incubated in an oven at sub-boiling conditions. We found that
small thiols dramatically enhance the thermal stability of gold nanorods. For instance,
after one hour at 90C, samples with pure PEG lost more than 70% of optical ab-
sorbance at their initial peak position, while particles coated with a monolayer of
methylbenzenethiol remained nearly unchanged. Our fi ndings will help
researchers to design novel tags that overcome the limitations related to thermal and
photo-instabilities in a broad variety of applicative contexts.

Speaker

Boris Khlebtsov
IBPPM RAS
Россия

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